Events OS Metrics

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Revision as of 14:13, 22 September 2017 by Ovidiu (talk | contribs) (→‎CpuUserTime)
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Internal

Overview

CPU Metrics

CpuUserTime

The percentage of total CPU time spent executing code in user mode. By default, this metric is calculated based on subsequent values read from/proc/stat during two subsequent collections. It is also possible to get the value from the top command output, but this has to be configured explicitly.

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CpuNiceTime

The percentage of total CPU time spent executing code in user mode with low priority (nice).

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CpuSystemTime

The percentage of total CPU time spent executing system calls on behalf of processes. The metric was used to be named "CpuKernelTime", but the name was deprecated.

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CpuIdleTime

The percentage of total CPU time spent in idle mode.

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CpuIoWaitTime

The percentage of total CPU time spent waiting for I/O to complete. The CPU will not wait for IO, it will be schedule onto another task or will enter idle state. When a CPU goes into idle state for outstanding task I/O, another task will be scheduled on this CPU. On a multi-core CPU, the task waiting for I/O to complete is not running on any CPU, so the iowait of each CPU is difficult to calculate.

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CpuHardwareInterruptTime

The percentage of total CPU time spent servicing hardware interrupts.

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CpuSoftwareInterruptTime

The percentage of total CPU time spent servicing software interrupts.

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CpuStolenTime

The percentage of total CPU time spent in other operating systems when running in a virtualized environment. More details:

Steal Time

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CpuGuestTime

The percentage of total CPU time spent running a virtual CPU for guest operating systems under the control of the Linux kernel.

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CpuGuestNiceTime

The percentage of total CPU time spent running a virtual CPU for niced guest operating systems under the control of the Linux kernel.

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Memory Metrics

PhysicalMemoryFree

The amount of physical RAM, left unused by the system.

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PhysicalMemoryTotal

Total amount of usable RAM, which is the amount of physical RAM installed on the system minus a number of reserved bits and the kernel binary code.

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PhysicalMemoryUsed

The amount of physical memory used by processes. It is calculated with the formula:

Used Physical Memory = MemTotal - MemFree - Buffers - Cached

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Swap Metrics

SwapFree

The total amount of free swap.

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SwapTotal

The total amount of swap available.

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SwapUsed

The amount of swap used by processes can be approximated with the formula:

Used Swap = SwapTotal - SwapFree

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Load Average Metrics

LoadAverageLastMinute

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LoadAverageLastFiveMinutes

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LoadAverageLastTenMinutes

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